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Re: Adding sparse matrices [message #63878 is a reply to message #63876]

Fri, 21 November 2008 11:03

pgrigis
Messages: 436
Registered: September 2007

Senior Member

Luis wrote:
> On Nov 21, 4:10�pm, Vince Hradil <vincehra...@gmail.com> wrote:
> :-) My mail wasn't very detail...
>
> Unfortunately I can not use c = sprsin(fulstr(a) + fulstr(b)) (Out of
> memory problems)

Well, it seems that the algorithm is obvious enough:
if an element is in a and not in b, copy it to c
if an element is in b and not in a, copy it to c
if an element is in a and in b, put the sum in c

Ciao,
Paolo

>
>> On Nov 21, 9:59�am, Vince Hradil <vincehra...@gmail.com> wrote:
>>
>>> On Nov 21, 9:27�am, Luis <lgmen...@gmail.com> wrote:
>>
>>>> Hi,
>>
>>>> Does anyone know how to add two sparse matrices?
>>
>>>> Tks,
>>>> Luis
>>
>>> c = a + b ?
>>
>> Sorry (removing foot from mouth and humbly retreating...)

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[Message index]

		Re: Adding sparse matrices By: Jeremy Bailin on Fri, 21 November 2008 11:24
		Re: Adding sparse matrices By: Jean H. on Fri, 21 November 2008 10:52
		Re: Adding sparse matrices By: pgrigis on Fri, 21 November 2008 11:03
		Re: Adding sparse matrices By: Jeremy Bailin on Fri, 21 November 2008 10:52
		Re: Adding sparse matrices By: colerbe on Fri, 21 November 2008 09:15
		Re: Adding sparse matrices By: David Fanning on Fri, 21 November 2008 08:22
		Re: Adding sparse matrices By: Vince Hradil on Fri, 21 November 2008 08:10
		Re: Adding sparse matrices By: Jeremy Bailin on Fri, 21 November 2008 08:01
		Re: Adding sparse matrices By: Vince Hradil on Fri, 21 November 2008 07:59

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